The Bay Area Air Quality Management District said the unhealthy air quality is moving down to Alameda, Contra Costa, San Francisco and San Mateo counties.
"If you have masks available, you should use them", said Kristine Roselius, a spokeswoman for the Bay Area Air Quality Management District.
A 0-100 scale ranks the pollution. Visit the site to find ratings for other cities around the world. As winds continue moving, Friday and Saturday should see a return to poor air quality, Flannigan said. Windows and doors should be kept closed to prevent indoor air from becoming dirty. "So, sending them home doesn't seem to be a better situation".
The Homeless Outreach Team (HOT) will also perform wellness checks throughout San Francisco and providing transportation (upon request) to shelters.
Schools across the region have already issued warnings to limit outdoor activity, with many bringing recess and P.E. classes indoors. 80 flights were cancelled as of Tuesday night, at the request of the Federal Aviation Administration, which put the airport on "a delay program, which slows the pace of arriving flights to provide greater separation between aircraft" due to visibility issues related to the smoke. "In an hour, they were four boxes down just because of the smoke", said Eleanor Fernandez, a Kaiser Permanente volunteer, who added that she felt "light-headed because of the smoke". People across the state are breathing in unhealthy air, putting people with asthma and other respiratory conditions at particular risk.
The issues with air quality are expected to extend into the weekend, a problem that's spurred the cancellation of the Virgin Sport "Festival of Fitness" planned for SF this weekend, event organizers say on their website.
"It's like smoke all over the place", said Morgan Butler, a Richmond resident.
The favorable weather will not last long, though.
"The Raiders family expresses our deepest concern for everyone affected by the North Bay fires", said Raiders President Marc Badain. "On Wednesday and Thursday, you're going to start seeing more smoke".